From Stanford in the Vale to Wantage on A417 the road is muddy and slippy caused by a significant number of earth moving lorries using this route. There was an accident with a car going off the road partly due to the slippery conditions yesterday. Earlier in the week when wet conditions there was so much muddy spray covering the windscreen from the lorries I could barely see where I was going.Please ensure the road is kept clean to avoid further accidents.